Drupal Site off-line

[chris]

The physical server running the virtual servers has been upgraded, this is why there was downtime this morning, everything seems to be up OK apart from Drupal:

Site off-line

The site is currently not available due to technical problems. Please try again later. Thank you for your understanding.

I don't know the cause of this, I have restarted nginx, php5-fpm and mysqld.

[sam]

Great, site is back.

Thanks Chris.

[chris]

Problems like this usually relate to issues related to the connection with MySQL, it is up:

/etc/init.d/mysql status
[info] /usr/bin/mysqladmin  Ver 9.0 Distrib 5.5.50-MariaDB, for debian-linux-gnu on x86_64
Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.

Server version          5.5.50-MariaDB-1~wheezy
Protocol version        10
Connection              Localhost via UNIX socket
UNIX socket             /var/run/mysqld/mysqld.sock
Uptime:                 5 min 52 sec

Threads: 1  Questions: 42787  Slow queries: 4  Opens: 665  Flush tables: 2  Open tables: 128  Queries per second avg: 121.553.

But Redis isn't running:

/etc/init.d/redis-server status
redis-server is not running

And won't run:

/etc/init.d/redis-server start
Starting redis-server: touch: cannot touch `/var/run/redis/redis.pid': No such file or directory

So:

mkdir /var/run/redis
chown redis:redis /var/run/redis/

/etc/init.d/redis-server start
Starting redis-server: redis-server.

/etc/init.d/redis-server status
redis-server is running

And this has been added to the root crontab so it does start on boot next time:

@reboot mkdir /var/run/redis ; chown redis:redis /var/run/redis ; /etc/init.d/redis-server start

I think that solves this issue, closing this ticket.